assert(prior_n->is_Region()) failed: must be a post-dominating merge point

ADDITIONAL SYSTEM INFORMATION :
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug compiled mode linux-amd64 compressed oops)

A DESCRIPTION OF THE PROBLEM :
I ran a modified regression test case on JDK8u392 and found that the JVM crashed with -Xcomp options.
The modifications I made are in lines 35 to 40 of the code. The error message obtained after execution does not match the bug corresponding to the original regression test, which is JDK-8285835. Additionally, I only used the -Xcomp option, which is different from the options used in the original regression test. I believe this is a new issue that needs to be addressed.


#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data/jdk8u/hotspot/src/share/vm/opto/split_if.cpp:285), pid=22821, tid=0x00007f10bfefe700
# assert(prior_n->is_Region()) failed: must be a post-dominating merge point
#
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug compiled mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
java -Xcomp TestBrokenEA

ACTUAL -
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/split_if.cpp:285
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data/jdk8u/hotspot/src/share/vm/opto/split_if.cpp:285), pid=22821, tid=0x00007f10bfefe700
# assert(prior_n->is_Region()) failed: must be a post-dominating merge point
#
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug-b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug compiled mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/repository/toreport/TestBrokenEA_09_27_22_51_03/hs_err_pid22821.log
#
# Compiler replay data is saved as:
# /home/repositor/toreport/TestBrokenEA_09_27_22_51_03/replay_pid22821.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

---------- BEGIN SOURCE ----------
The source code file and hs_err file are available at the URL:
https://drive.google.com/file/d/1SdNV6rmWcRkgHvPEb5S73tcPP1l7FEYG/view?usp=drive_link
---------- END SOURCE ----------

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